Experimental investigation of polypyrrole coating doped with chromium nitride nanoparticles on aluminum alloy bipolar plates for PEMFC

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2024-11-25 DOI:10.1007/s10853-024-10467-0

S. J. Narasimharaju, K. Annamalai, B. Poorna Chandra Rao, P. Sakthivel

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引用次数: 0

Abstract

Proton exchange membrane fuel cells (PEMFCs) are efficient, environmentally friendly devices for applications such as transportation and stationary power generation. The bipolar plate (BP) is a key component in PEMFCs, responsible for electrical conductivity, gas distribution, and water management. 6061 aluminum alloy (AA) is commonly used for BPs due to its lightweight and conductive properties, but it is prone to corrosion. This study examines the efficacy of polypyrrole (PPy) coatings that are enhanced with chromium nitride (CrN) nanoparticles (NPs) on 6061 AA specimens. These coatings greatly enhance the corrosion resistance, polarization resistance, and protection efficiency of the 6061 AA. Out of all the coatings that were tested, the PPy-CrN_0.2 coating stood out as the top performer. It showed a positive corrosion potential (E_corr) of − 0.51 V versus SCE and a significantly lower corrosion current (I_corr) of 0.44 µA/cm². This coating demonstrates the highest polarization resistance value of 47,904.53 Ω/cm² and achieves an impressive protection efficiency of 72.84%, surpassing other coated specimens. In addition, the PPy-CrN_0.2 coating demonstrates exceptional protective properties, boasting an impressive impedance value (Z) of 5019 Ω/cm². This underscores its remarkable effectiveness in preventing the infiltration of corrosive ions, as confirmed by electrochemical impedance spectroscopy. Future characterization studies, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) will further elucidate the structural and functional properties of the PPy-CrN_0.2 coating. Additionally, interfacial contact resistance (ICR) measurements were conducted to assess the electrical performance of the coating. The PPy-CrN_0.2 coating demonstrated the lowest ICR value of 18.4 mΩ/cm² at a compaction pressure of 1.4 MPa, confirming its improved conductivity and suitability for PEMFC applications. These findings highlight the importance of ICR testing in evaluating the overall performance and efficiency of the PPy-CrN_0.2 coating in PEMFC systems.

Graphical abstract

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纳米氮化铬掺杂聚吡咯在PEMFC铝合金双极板上的实验研究

质子交换膜燃料电池（pemfc）是一种高效、环保的设备，适用于运输和固定发电等应用。双极板（BP）是pemfc的关键部件，负责导电性、气体分布和水管理。6061铝合金（AA）由于其轻质和导电性能，通常用于bp，但容易腐蚀。本研究考察了氮化铬（CrN）纳米颗粒（NPs）增强聚吡咯（PPy）涂层在6061 AA样品上的效果。这些涂层大大提高了6061 AA的耐腐蚀性、抗极化性和防护效率。在所有测试的涂层中，py - crn0.2涂层表现最佳。与SCE相比，它的腐蚀电位（Ecorr）为- 0.51 V，腐蚀电流（Icorr）为0.44 μ a /cm2。该涂层极化电阻值最高，达到47,904.53 Ω/cm2，防护效率高达72.84%，优于其他涂层。此外，py - crn0.2涂层表现出卓越的保护性能，具有5019 Ω/cm2的阻抗值(Z)。这强调了它在防止腐蚀离子渗透方面的显著有效性，正如电化学阻抗谱所证实的那样。未来的表征研究，包括x射线衍射（XRD），傅里叶变换红外光谱（FTIR），扫描电镜/能量色散光谱（SEM/EDS）将进一步阐明py - crn0.2涂层的结构和功能特性。此外，还进行了界面接触电阻（ICR）测量，以评估涂层的电性能。在1.4 MPa的压实压力下，py - crn0.2涂层的ICR值最低，为18.4 mΩ/cm2，证实了其电导率的提高和PEMFC应用的适用性。这些发现强调了ICR测试在评估PPy-CrN0.2涂层在PEMFC系统中的整体性能和效率方面的重要性。图形抽象

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.